Creating Project Files:Involved Project File
Infiltration can be included in the simulations using one of the optional methods. For the sake of this example, Green & Ampt infiltration will be simulated, which requires additional inputs of porosity, saturated hydraulic conductivity, capillary head parameter, and initial water content as maps or as Mapping Table inputs related to index maps. We will assume that these data are saved in maps named “simple.por”, “simple.sat”, “simple.cap”, and “simple.moi”, respectively. Spatially distributed rainfall will also be input, with two rain gages using inverse distance squared interpolation. The rainfall data are stored in a file called “simple.gag”. A single channel, which consists of two links, will also be simulated. The channel input data file will be called “simple.cip”, with a the channel/grid connectivity file "simple.gst". The format of the channel input files is described in Chapter 5.
The resulting project file for this simulation appears as:
GSSHAPROJECT WATERSHED_MASK simple.msk ELEVATION simple.ele QUIET GRIDSIZE 50.0 ROWS 10 COLS 10 TOT_TIME 2000 TIME STEP 20.0 MANNING_N 0.036 PRECIP_FILE simple.gag RAIN_INV_DISTANCE GREEN_AMPT POROSITY simple.por CONDUCTIVITY simple.sat CAPILLARY simple.cap MOISTURE simple.moi CHAN_EXPLIC CHANNEL_INPUT simple.cip STREAM_CELL simple.gst SUMMARY simple.sum HYD_FREQ 30 OUTLET_HYDRO simple.hyd
Notice that the START_DATE and START_TIME project file cards have been removed. These two cards are required only for spatially- and temporally-uniform precipitation, because this information is contained in the precipitation input data file. Also note that the OUTCOL, OUTROW, and OUTSLOPE project file cards have been removed, because they are not required when channel routing is enabled. The outlet of the catchment is determined from the overland flow/channel flow connectivity information provided by the link and node maps.
The four maps simple.por, simple.sat, simple.cap, and simple.moi can also be replaced with tabled values related to an index map, such as a soil texture map. This is the standard way processes are assigned parameter values in WMS 6.1 and higher. In this case the project file would look like.
GSSHAPROJECT WMS 8.1 WATERSHED_MASK simple.msk FLINE simple.map ELEVATION simple.ele UNITS 0 QUIET GRIDSIZE 50.0 ROWS 10 COLS 10 TOT_TIME 2000 TIME STEP 20.0 MANNING_N 0.036 PRECIP_FILE simple.gag RAIN_INV_DISTANCE GREEN_AMPT MAPPING_TABLE simple.cmt DIFFUSIVE_WAVE CHANNEL_INPUT simple.cip STREAM_CELL simple.gst SUMMARY simple.sum HYD_FREQ 30 OUTLET_HYDRO simple.hyd
And the Mapping Table file named simple.cmt would contain the values of hydraulic conductivity, porosity, suction head, and initial moisture, which would be indexed to integer based index maps, such as a soil-texture map, as described in Section 12. Notice that WMS adds informtion it needs to the project file, including the WMS release verion, and the GIS like map information in the FLINE card. GSSHA ignores these and any other unrecognized project cards, and provides a warning to the screen during execution. Notice that WMS substitues DIFFUSIVE_WAVE for CHAN_EXPLIC, either is acceptable.
- 15 Creating Project Files